US2106079A - Electric lamp - Google Patents

Electric lamp Download PDF

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Publication number
US2106079A
US2106079A US31486A US3148635A US2106079A US 2106079 A US2106079 A US 2106079A US 31486 A US31486 A US 31486A US 3148635 A US3148635 A US 3148635A US 2106079 A US2106079 A US 2106079A
Authority
US
United States
Prior art keywords
bulb
plane
reflecting
longitudinal axis
electric lamp
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US31486A
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English (en)
Inventor
Bergmans Jan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Application granted granted Critical
Publication of US2106079A publication Critical patent/US2106079A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/28—Envelopes; Vessels
    • H01K1/32—Envelopes; Vessels provided with coatings on the walls; Vessels or coatings thereon characterised by the material thereof
    • H01K1/325—Reflecting coating

Definitions

  • My invention relates to electric lamps and more degrees. This plane will be referred to hereinafter as the main plane.
  • the vertex angle of the cone measured in a second vertical plane at.
  • auxiliary plane This plane will be referred to hereinafter as the auxiliary plane.
  • FIG. 1 is a perspective view of an incandescent lamp comprising my invention
  • Fig. 2 is 9. diagrammatic section through the bulb in the main plane and at right angles to the longitudinal axis of the lamp seen in Fig. 1
  • Fig. 3 is a bottom view of the lamp
  • Fig. 4 is a. perspective representation of the sub-conical light beam. emitted by the lamp
  • Fig. 5 is a. representation of the light intensity of the reflected beam in the main plane
  • Fig. 6 is a similar representation for the auxiliary plane at enlarged scale.
  • the lamp comprises a bulb it having a base ll attached thereto.
  • the neck of the bulb with the base attached thereto is shown in the drawings as being in the longitudinal axis of the bulb, but it may be located at some other part if desired.
  • the upper part of the bulb is provided with a reflecting surface M, such as a silver coating on the inner or outer surface thereof.
  • the shape of the bulb is such that the curvature of cross-sections of the reflecting part of the bulb in planes which are perpendicular to the main plane and pass through the center of the filament, or through the longitudinal axis of the bulb, increases as the auxiliary plane is approached.
  • the cross-section of the reflecting part of the bulb in the main plane comprises two parabolic side portions AB and CD which extend over a. sector angle of 30 to 40 degre'es.
  • the lines AD and CB are the axes of these portions CD and AB respectively.
  • the intermediate portion AEC of the said section of the reflecting surface increases in curvature as the auxiliary plane is approached, that is, the distance from the center M of the bulb to the bulb wall increases as the top E of the bulb is approached. (The distance ME is greater than the distance MA.)
  • the filament is preferably located at the center of the bulb. If the filament can be so concentrated that its length is approximately 0.15 times the length of the bulb axis, then it may be disposed in said axis. However, if this is not possible, the filament is preferably disposed in the main plane perpendicular to the line of.intersection of the main and auxiliary planes, in which case the filament is made linear or v-shaped. In the latter case, the legs of theV-shaped filament are preferably located in the axes of the parabolic portions of the bulb to prevent the light emitted directly by the filament from having a blinding efiect. I
  • the filament l3 shown in the drawings is V- shaped and is located in the main plane so that the apex of the filament faces the transpment ribs or flutes H or with other difiusing means in order to obtain a more uniform light.
  • Fig. 4 shows the reflected sub-conical beam which is emitted by the lamp, the base K on the plane V being elongated.
  • the vertex angle of the cross-section of the beam in the main plane has a maximum value of 160 degrees.
  • the vertex angle of the cross-section of the beam in the auxiliary plane has a maximum value of '15 degrees.
  • Figs. 5 and 6 illustrate the light intensities of the beam in the main and auxiliary planes respectively.
  • the intensity of the light increases toward the outer edge of thebeam, while in the auxiliary plane, as shown in Fig. 6, the intensity is substantially uniform.
  • An electric lamp comprising a. bulb having increasing curvature as the sections are taken in planes approaching the'middle of said reflecting portion from its sides, and a light source located within said reflecting bulb portion.
  • an electric lamp comprising a bulb having an elongated concave light-deflecting portion so shaped that cross-sections thereof in planes passing through the longitudinal axis thereof are of increasing curvature as the sections are taken in planes approaching-the middle 01' said reflecting portion from its sides, the cross-section of said reflecting bulb portion at the middle thereof in a plane transverse to said longitudinal axis comprising parabolic side portions and'an intermedi ate portion of increasing curvature from the sides to the middle, and a light source located within said reflecting bulb portion.
  • An electric lamp comprising a bulb having an elongated concave light-reflecting portion, the
  • An electric lamp comprising a bulb having planes approaching the middle of said reflecting portion from its sides, the cross-section of said reflecting bulb portion at the middle thereof in a plane transverse to said longitudinal axis comprising parabolic side portions and an intermediparabolic side portions and an intermediate portion of increasing curvature from the sides to its middle, and a V-shaped filament located at the middle of said reflecting bulb portion in a plane transverse to the longitudinal axis and with its leg portions extending toward the said concave reflecting bulb portion along the axes of the said parabolic side portions.
  • An electric lamp comprising a bulb having 7 an elongated concave light-reflecting portion so shaped that cross-sections thereof in planes passing through the longitudinal axis thereof are of increasing curvature as the sectionsare taken in planes approaching the middle of said reflecting portion from its sides, the cross-section of said reflecting bulb portion at the middle thereof in a plane transverse to said longitudinal axis comprising parabolic side portions ,and an intermediate portion of increasing" curvature from the sides to the middle, and a V-shaped fllament located at the middle of said reflecting bulb portion in a plane transverse to the longitudinal axis and with its leg portions extending toward the said concave reflecting bulb portion along the axes of the said parabolic side portions.

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  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Optical Elements Other Than Lenses (AREA)
US31486A 1934-07-26 1935-07-15 Electric lamp Expired - Lifetime US2106079A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL459362X 1934-07-26

Publications (1)

Publication Number Publication Date
US2106079A true US2106079A (en) 1938-01-18

Family

ID=19786374

Family Applications (1)

Application Number Title Priority Date Filing Date
US31486A Expired - Lifetime US2106079A (en) 1934-07-26 1935-07-15 Electric lamp

Country Status (6)

Country Link
US (1) US2106079A (enrdf_load_stackoverflow)
BE (1) BE410339A (enrdf_load_stackoverflow)
DE (1) DE694811C (enrdf_load_stackoverflow)
FR (1) FR792373A (enrdf_load_stackoverflow)
GB (1) GB459362A (enrdf_load_stackoverflow)
NL (1) NL47905C (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD321404S (en) 1990-03-29 1991-11-05 Falburg Films Corporation Light bulb

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD321404S (en) 1990-03-29 1991-11-05 Falburg Films Corporation Light bulb

Also Published As

Publication number Publication date
NL47905C (enrdf_load_stackoverflow)
GB459362A (en) 1937-01-01
DE694811C (de) 1940-08-08
FR792373A (fr) 1935-12-30
BE410339A (enrdf_load_stackoverflow)

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